Keithley 6220, Reference Manual

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4-2 Sweeps Model 6220/6221 Reference Manual
Return to Section 4 topics
Overview
Section overview
Following a brief “ Sweep overview ” of the three types of sweeps (linear staircase,
logarithmic staircase, and custom), the documentation in this section provides
detailed information on characteristics, front panel operation, and SCPI command
programming for each type of sweep as follows:
• " Linear staircase sweeps", page 4-4
• " Logarithmic staircase sweeps", page 4-5
• " Custom sweeps", page 4-6
• " Front panel sweep operation", page 4-10
• " Remote sweep operation", page 4-14
Sweep overview
As shown in Figure 4-1 , the Model 622x Current Source can generate three types
of DC current sweeps.
Linear staircase sweep – With this sweep type, the current increases or
decreases in specific steps, beginning with a start current and ending with a stop
current.
Figure 4-1 A shows an increasing linear staircase sweep from a 1mA start
current to a 5mA stop current in 1mA steps. The bias current is the fixed current
setting just prior to the start of the sweep. The current output will remain at the last
point in the sweep after completion.
Logarithmic staircase sweep – In this case, the current increases or decreases
logarithmically, beginning with a start current and ending with a stop current.
Figure 4-1 B shows an increasing log staircase sweep from a 0.1mA start current
to a 100mA stop current with logarithmic steps. Again, the bias current is the fixed
current setting just prior to the start of the sweep. The current output will remain at
the last point in the sweep after completion.
Custom sweep – The custom sweep allows you to program arbitrary sweep steps
anywhere within the output current range of the Model 622x. Figure 4-1 C shows a
typical custom sweep with arbitrary steps. As with the other two sweep types, the
bias current is the fixed current setting just prior to the start of the sweep. The cur-
rent output will remain at the last point in the sweep after completion.
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